CHICAGO — Police arrested the estranged brother-in-law of Jennifer Hudson on Monday in the deaths of the entertainer’s mother, brother and young nephew, taking him from a prison where he had been held on a suspected parole violation.

William Balfour was arrested at the Stateville Correctional Center and released to detectives as he awaited formal charges in the shooting deaths of the singer and Oscar-winning actress’ relatives, said Chicago police spokeswoman Monique Bond.

Until Monday, police had identified Balfour, 27, only as a “person of interest” in the investigation. He had not been charged by late Monday afternoon, said Andy Conklin, a spokesman for office of the Cook County state’s attorney.

The bodies of Jennifer Hudson’s mother, Darnell Hudson Donerson, and her brother, Jason Hudson, were discovered Oct. 24 at the family’s home on the South Side of Chicago. Her nephew Julian King, 7, was found dead three days later in a sport utility vehicle on the West Side. All three had been shot.

Police took Balfour into custody the same day the bodies of Donerson and Jason Hudson were discovered. After 48 hours — the longest Chicago police can hold a person without charges — Balfour was taken by the Illinois Department of Corrections on the suspected parole violation.

What do you do in a rental market where seemingly every new apartment building is offering a boatload of amenities and high-end finishes? If you're Charleston, S.C.-based apartment developer Greystar you double down and build an extra luxury project.